Which Article of Indian Constitution prescribes Hindi in Devanagari script as the official language of the Union?
(A) 341
(B) 342
(C) 343
(D) 346

Hint:
The Indian constitution stated that the official language of the Union should be Hindi in the Devanagari text instead of the existing English. But this was thought to be a violation of the constitutional guarantee of unity. Later, a constitutional amendment, The Official Languages ​​Act, 1963, allowed English to continue in the Indian government until the law decided to change it.

Complete step by step solution:
The official language of the Union will be Hindi in Devanagari text. The type of numbers to be used for official purposes of the Union will be the international type of Indians. For the fifteen years since the commencement of this Constitution, the English language will continue to be used for all official purposes of the Union in which it was used immediately before the commencement of that process. Provided that the President, at this time, may authorize 1 by authorizing the use of the Hindi language in addition to the English language and the Devanagari numerals above the international Indian states for any official purposes of the Union. Notwithstanding anything contained in this article, Parliament may by law provide for the use, after a specified period of fifteen years-

(a) the English language, or
(b) the type of Devanagari numbers,


Hence, the correct answer is option C.

Note:
 In terms of Article 343 of the Constitution of India 1949 The official language of the Union shall be Hindi in the Devanagari text The type of numbers to be used for the official purposes of the Union shall be the international type of Indian prices.